The round pound has been on its way out for months and on October 15, it'll be wiped out for good.

After then, it will no longer be classed as legal tender, meaning the only thing you'll be able to do with it is trade it for a new one at your local bank or post office.

While the Treasury is warning consumers to get spending and swapping - money experts say there are some old editions that you shouldn't get rid off - as they could be worth up to 19 times more than face value, according to The Mirror.

Even though that's only £20, it's still quite a lot for 100 pennies - and if you've got a few of them, you can sell them all.

Here are five round pounds that shouldn't be swapped, traded or spent, according to the experts at ChangeChecker, who say these coins are of such worth because so few of them were ever struck.

It's worth noting that these valuations are based on coins that have recently sold on auction sites - the better the condition, the more your coin will sell for too.

The Scotland: Edinburgh City £1 Coin

The Edinburgh City £1 coin.

The Edinburgh City £1 coin was released in 2011 with a mintage of just 935,000, making it the least circulated round pound by far.

Such is the rarity that only 17% of ChangeChecker coin collectors have ever spotted one in their pockets.

According to the website, this coin currently sells for between £12 and £16.

How much we found it for on eBay: On 21 September, one of these coins sold for £13.01 on eBay after ramping up seven bids. Various other sellers have sold theirs for upwards of £8.

The Wales: Cardiff City £1 Coin

The Cardiff City £1 coin.

This 'Wales: Cardiff City' coin was released in 2011 and is one of the rarest in circulation (Image: ChangeChecker)

Another of the capital cities series, the Cardiff City £1 coin is definitely one to keep.

Released in 2011, this coin has a mintage of just 1,615,000 and is second in ChangeChecker's Scarcity Index (which measures rarity) with a score of 88 of 100.

This coin depicts the circular Coat of Arms of Cardiff as the principal focus to represent Wales.

This coin is worth between £11 and £15.

How much we found it for on eBay: Last week, this coin sold for £20 on eBay which suggests it there's a lot more demand for it than experts think.